Posted by presalie on .
a cyclist travels at a distance of 10.0 km. in 30 min. after w/c he speeds up to 40 km/hr for 6.0 more mins. Find his average speed.

physics 
drwls,
How long was he in the W.C. ?
Divide his total distance traveled by total elapsed time, which is 0.6 hours plus W.C. time.